Phonograph.



n STATES PATENT OFFICE.

ALEXIS W. PEVARE, F BOSTON, MASSACHUSETTS.

PHONOGBAIPH.

Specification of Letters Patent.

Patented Jan. 21, 1919.

Application filed November so, 1917. Serial No. 204,590.

' ton, in the county of Sufl0lk and State of 1s hereinafter described assachusetts, invented certain new and useful Improvements in Phonographs,

of which the following is a specification.

he object of my invention is to improve the quality of the sound reproduction obtainable honographs by providing such means whereby vibrations intended to be reproduced by the needle, such as mechanical noises due to the operation of the motor and to the metallic character of various structural parts ofthe instrument, will be largely suppressed. The invention canbe readily odied in an attachment adapted to be a plied to existing phonographs without structural alteration of the latter, and such an attachment as constructed for use in a phonograph of the usual disk-record type in connection with the accompanyin' drawing, in which Figure 1 is a ace view of the under side of the horizontal board usually employed in phonographs for carrying the motor, with my attachment applied thereto, and

Fig. 2 is a transverse section on the line 2-2 Fig. 1, showin also in side elevation the rotating table w 'ch carries the record. In the drawing, which shows only such parts of a phonograph as are required for explainin my invention, 2 indicates the board WlllCll carries the motor on its under side, 3 indicates the motor, of which only the ame is shown, 4 indicates the table which is rotated by the motor and carries the record, and 5' indicates the s indle by which the table 4 is supported an connected to the motor. The specific construction of these parts is immaterial to myinvention, the construction illustrated being such as is commonly .emplo ed in a Victor phonograph, in which tile board above referred to is supported on a pair of hinges represented in art by the clips shown at 66.

y attachment consists essentially of a sheet 7 made of soft rub r and provided with a soft-rubber rib 8 a pted round the motor, the rib being preferably integral with the sheet. The attachment is he under side of the board 2 l with the sheet 7 located between the board with the rib 8 projectand completely preferably of the same size as around the motor at. a short distance therefrom, as shown in Fig. 1. The sheet 7 is preferably about finds of an inch in thickness and has a margin outside of the rib for attachment purposes. It is also rovided with a perforation 9 through w ich the spindle 5 passes, this perforation being the overlying hole in the board 2. i rib 8 and its distance three-quarters of an inch from the motor frame, although it is not necessary for the rib to curve inward to this extent at points where the motor frame is laterally indented. In general, the smaller the rib the closer it should be located to the motor frame, but in any case it should have sufficient mass to absorb the vibrations which it is intended to eliminate. If the rib is too large, or if the sheet 7 is too thick, the tones produced by the phonograph will be deadened.

he attachment above described is prefera'bly provided with a cover conforming in outline to the sheet 7 and consisting of a flat outer flange 10 adapted to rest on the margin of the sheet 7, an inner flange 11 shaped to surround the motor frame at a short distance therefrom and a vertical portion 12 which connects the two flanges and is of such dimensions that it and the inner flangeare located close to but out of contact with the rib 8. The cover when employed is preferably made of hard rubber andjs secured 'in place by screws 13 passing throu h the flange 11 and through the marginof t e sheet 7 into the board 2. It is not essential, owever, and is not shown in F'g. 1, its principal function being to protect the soft rubr parts and present an attractive appearance.

I have found that the addition of my attachment to a phonograph results in a marked improvement in the tone of the in strument, which is slightly increased in vol ume and de much clearer, so that certain parts of records can be heard which were the needle and metallic sound w ich is so erceptible in ordinary phono aphic tones. t has a particularly noticea le effect on vocal records'by aocentuating the distinction noise made by eliminates the itself or between the vocal tones and the accompaniment. These results are very largely due to the presence of the rib, as distinguished from the mere cushioning efiect of the sheet which carries the rib, and apparently the rib acts by absorbing or otherwise suppressing vibrations originating in the motor transmitted thereto from themtating table without in any way afiecting the reproduced vibrations transmitted by the needle to the horn, the latter vibrations being thus given forth without being mixed with or impaired by extraneous noises re: sulting from the operation of the mechani" cal parts. 1

My attachment can evidently be adapted and applied to various sizes and styles of phonographs without in any way disturbing the original construction of their parts, and when once attached it needs no further attention. If preferred, however, its essential features can be readily embodied in phonographs at the time when they are made. The term intended to include rubber substitutes and other substances having substantially the same physical qualities as soft india rubber. I claim 1. The combination with a phonograph of a soft-rubber sheet interposed between and overlying its outer face,

soft rubber, as used herein, is-

the motor and the support for the latter and provided with a softubber rib surrounding the motor. 1

.2. The combination with a phonograph of a soft-rubber sheet interposed between the motor and the support for the latter and provided with a soft-rubber rib surrounding the motor, and a cover surrounding said rib out of contact therewith.

3. An attachment for phonographs comprising a sheet of soft rubber a apted to be interposed between the motor and thesupport for the latter and provided on one face with a soft-rubber rib adapted to'surround the motor; I

a. An attachment for phonographs comprising a sheet of soft rubber provided on one face with a soft-rubber rib adapted to surround the phonograph motor and located at a short distance from the outer ed e of the sheet, and a cover provided with a ange adapted to rest upon the margin of said sheet and extending thence around and over the outer face of said rib, out of contact with the latter.

Signed at Boston, Mass, this 27th day of November, 1917.

ALEXIS W. PEVARE. 

